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Income and other taxes - Net deferred income tax liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net $ (161,206) $ (217,153) $ (221,682) $ (164,091)
Deferred tax assets 111,614 60,065 59,532 102,341
Deferred tax liabilities (272,820) (277,218) (281,214) $ (266,432)
Property, plant and equipment (owned)        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net (447,077) (425,743) (425,743)  
Deferred tax assets (250,890) (212,087) (212,087)  
Deferred tax liabilities (196,187) (213,656) (213,656)  
Right-of-use assets        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net (45,501) (53,400) 0  
Deferred tax assets (26,725) (39,600) 0  
Deferred tax liabilities (18,776) (13,800) 0  
Repatriation taxes        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net (93,363) (94,446) (94,446)  
Deferred tax assets 0 0 0  
Deferred tax liabilities (93,363) (94,446) (94,446)  
Other        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net (10,424) (14,930) (14,930)  
Deferred tax assets (48) (6,700) (6,700)  
Deferred tax liabilities (10,376) (8,230) (8,230)  
Temporary differences including temporary differences with liability balances        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net (596,365) (588,519) (535,119)  
Deferred tax assets (277,663) (258,387) (218,787)  
Deferred tax liabilities (318,702) (330,132) (316,332)  
Non-capital loss carryforwards        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net 286,004 233,237 233,237  
Deferred tax assets 286,004 233,237 233,237  
Deferred tax liabilities 0 0 0  
Lease obligations        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net 56,802 63,415 0  
Deferred tax assets 33,979 45,239 0  
Deferred tax liabilities 22,823 18,176 0  
Share-based compensation        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net 3,075 10,908 10,908  
Deferred tax assets 0 1,170 1,170  
Deferred tax liabilities 3,075 9,738 9,738  
Other        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net 89,278 63,806 69,292  
Deferred tax assets 69,294 38,806 43,912  
Deferred tax liabilities 19,984 25,000 25,380  
Temporary differences including temporary differences with asset balances        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net 435,159 371,366 313,437  
Deferred tax assets 389,277 318,452 278,319  
Deferred tax liabilities $ 45,882 $ 52,914 $ 35,118